#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>


// 原文链接: https://blog.csdn.net/m0_60352504/article/details/130798248
// ./tcp_server
// ./tcp_client

int main(){
    //创建套接字
    int serv_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    //将套接字和IP、端口绑定
    struct sockaddr_in serv_addr;
    memset(&serv_addr, 0, sizeof(serv_addr));//每个字节都用0填充
    serv_addr.sin_family = AF_INET;//使用IPv4地址
    serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");//服务端IP地址
    serv_addr.sin_port = htons(1234);//端口
    bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));//绑定
    //进入监听状态，等待用户发起请求
    listen(serv_sock, 20);
    //接收客户端请求
    struct sockaddr_in clnt_addr;
    socklen_t clnt_addr_size = sizeof(clnt_addr);
    int clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
    //收发数据
    char buffer[1024] = {0};
    read(clnt_sock, buffer, sizeof(buffer)-1);
    printf("Message from client:%s\n",buffer);

    char str[] = "hello client";
    write(clnt_sock, str, sizeof(str));

    //关闭套接字
    close(clnt_sock);
    close(serv_sock);

    return 0;
}
